/* films2.c -- 使用结构链表 */

#include <stdio.h>
#include <stdlib.h>         /* 提供 malloc() 原型 */
#include <string.h>         /* 提供 strcpy() 原型 */

#define TSIZE   45          /* 存储片名的数组大小 */

struct film {
    char title[TSIZE];
    int rating;
    struct film * next;     /* 指向链表中的下一个结构 */
};

char * s_gets(char * st, int n);

int main(void)
{
    struct film * head = NULL;
    struct film * prev, *current;
    char input[TSIZE];

    /* 收集并存储信息 */
    puts("Enter first movis title:");
    while (s_gets(input, TSIZE) != NULL && input[0] != '\0')
    {
        current = (struct film *) malloc(sizeof(struct film));
        if (head == NULL)       /* 第 1 个结构 */
            head = current;
        else
            prev->next = current;
        current->next = NULL;
        strcpy(current->title, input);
        puts("Enter your rating <1-10>:");
        scanf("%d", &current->rating);
        while (getchar() != '\n')
            continue;
        puts("Enter next movie title (empty line to stop);");
        prev = current;
    }
    
    /* 显示电影列表 */
    if (head == NULL)
        printf("No data entered. ");
    else 
        printf("Here is the movie list:\n");
    current = head;
    while (current != NULL)
    {
        printf("Movie: %s Rating: %d\n",
            current->title, current->rating);
        current = current -> next;
    }

    /* 完成任务就，释放已分配的内存 */
    current = head;
    while (current != NULL)
    {
        current = head;
        head = current->next;
        free(current);
    }
    printf("Bye!\n");

    return 0;
}

char * s_gets(char * st, int n)
{
    char * ret_val;
    char * find;

    ret_val = fgets(st, n, stdin);
    if (ret_val)
    {
        find = strchr(st, '\n');    // 查找换行符
        if (find)                   // 如果地址不是 NULL，
            *find = '\0';           // 在此处放置一个空字符
        else
            while (getchar() != '\n')
                continue;
    }
    return ret_val;
}
// Spirited Away
// 9
// The Duwlists
// 8
// Devil Dog: The Mound of Hound
// 1
